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Q: Quantenoptik
Q 7: Quanteneffekte II
Q 7.3: Talk
Tuesday, April 4, 2000, 14:45–15:00, HS XI
Towards CQED with Microspheres: The Progress in Paris — •Wolf von Klitzing, Romain Long, Sebastien Steiner, Morgan Mitchel, Jean Hare, Valerie Lefevre-Seguin, Jean-Michel Raimond, and Serge Haroche — Laboratoire Kastler Brossel, Ecole Normale Superieure,75231 Paris 05, France
Dielectric microspheres are attractive optical resonators for applications ranging from Cavity Quantum Electrodynamics[1] to microlasers[2]. In small spheres (Ø ≃ 40 µ m) the mode volume of the Whispering Gallery Modes (WGMs) is of the order of only a few hundred cubic wavelengths thus leading to field strengths of the order of 1 kV/m. Quality factors of 109 are routinely achieved.
We are currently developing two systems which should allow us to reach the quantum regime: One coupling Rubidium atoms and the other coupling quantum dots to a whispering gallery modes of the microsphere. Once near the surface of such a microsphere a single alkali atom couples strongly to a single photon in a WGM. Similarily a single quantum-dot can sustain lasing possibly even without threshold. The progress towards coupling Rubidium atoms and quantum-dots to the spheres will be presented.
[1] F.Treussart et al. Opt.Lett.19, 1651 (1994)
[2] W.von Klitzing et al. El.Lett. 35, 1745 (1999)